Pulsator for milking machines



Aprily 2l, 1925. v 1,534,612

J. A. SCHMITT PULSATOR FOR MILKING MACHINES Filed NOV. 28, 1922 2Sheets-Sheet 1 l Awww-vw. @www Aprilzl, 1925. l 1,534,612

, J. A. SCHMITT PULSATQR FOR MLKING MACHINES Filed Nov. 28. -1922 2Sheets-Sheet 2 l l' y gnwmo@ 451m 45 .y v

with. the movable parts.

Patented pr. 21, 1925.

n UNITED STATES 1,534,612 PATENT oFFici-z."

JOHN A. SCHMITT, OF COLUMBUS,A 0HIOASSIGNOR TO THE UNIVERSAL MILKINGMACHINE COMPANY, OF COLUMBUS, CHIC, A CORPDRATION 0F OHIO.k

rULsA'ron ron- MILKING MACHINES.

Application filed November 28, 1922. Serial No. 6031,72?. Y

To all whom it may concern:

Be it known that I, J oHN A. SCHMITT, a citizen of the United States,residing at Columbus, in the county of Franklin and State of Ohio, haveinvented certain new and vuseful Improvements in Pulsators for MilkingMachines, of which the following is a specification.

My invention relates to fluid pressure actuated pulsators or alternatorsfor milking apparatus and analogous purposes.

The present application is a continuation and further development of thesubject matter of my co-pending applications for Letters Patent SerialNo. 505,257, filed October 4, 1921, and 539,167, filed February 25,1922.

VVhle involving the same general structural features and mode ofoperation, the present invention contemplates an improved form oftumbler mechanism for intermit-` tently reversing the iuid pressurecontrol valve and an improved and more economical means for connectingthe actuating piston Whereas the previous constructions referred toinvolved theuse of a tension spring shifted to and fro past a deadcenter relation, with the valve to be operated, upon which it exerts aconstant pulling influence, first in one direction and then in theother, the present construction is dependent upon a push and pull modeof transmitting movement from the prime actuator to thev movable valve`the movement of the valve being effected wholly upon one side of a deadcenter position, the valve being actuated by the reaction of acompression spring, intermittently.

compressed by both the push and pull impulses of the power transmissiondevices. This is accomplished by means of a telescopic powertransmission link having the compression spring so interposed betweenthe relatively rmovable telescopic members of the link, that botli theextension and contraction of such telescopic link will place the springunder compression. This telescopic link is connected eccentrically witha pivoted fluid pressure control valve, which is thereby moved .to andlfro across the pathof travel of a continuously moving`alternatingfstop` member, witliwvliicli 'tlievalve st {iuctureengages,firstupon one side fand;V l then .upon the other toiholdithevalveagainst' operative movement until the stop member and connected partsapproach the limit of their stroke in either direction. iection betweentlie actuating piston and the initial member of thev valve tumblingmechanisin is effected by a feather or key, carried by or movable vwiththe piston stem and having sliding engagement in afkey way or -="i inthe main structure or mount-ing and a non-sliding engagement in anelongated slotin the operated member, wherebythe latter' ismaintained inproper alignment during its reciprocation in unison with the piston. l

The object of the invention is tov simplify the structure as well as themeans and mode of operation of valve reversing or tumbling mechanism forpulsator structures and the limit of the operative stroke, and tofurther t afford a. construction employing a compression spring, whichwill afford kgreater uniformity of action and longer period of usetfulness, than a spring subjected to elongation.

A further object of the invention is to afford a structure which may beproduced with inexpensive machine operation, and,

which will require minimum adjustment and accuracy of fit, the valvemembers being of a substantially free oating type, subjected to minimumdisplacement strain, whereby they will tend to 'automatically find theirseat, and maintain close contact under pre` ponderance of atmosphericpressure.

A further object of the invention is to The conprovide an improvedconnection between the,

prime actuator and the operated member,r

which will maintain the latter in predetermined alined path of" travelwithout presenting` difficulties ori obstructions to economical machineoperations. A further object of the invention "is to provide an improvedsafety device v for the throttle control member,l which while'z peremjitting ready I andeasy; adjustment, will pre1; i vent accidentalichange= of'adjustinent` under' influence of vibration.

With the above prima-ry and other incidental objects in view as willmore fully appearw'in the specification, the invention consists of thefeatures of construction, the parts and combinations thereof, and themode of operation, orvtheir equivalents as hereinafter described and setforth in the claims.

'In the accompanying drawings, wherein is shown the preferred,butobviously not necessarily the only form of embodiment of invention',Fig. 11is a top plan view-.ofthe assembled' pulsatorshowing the parts ofthe tumbler mechanism..,aproaching the limit of theirstroke intheldirection indicated by the darts.. Fig. 2 .is .aA side elevation of theassembledk pulsator structure. Fig. 3 is a top` plan view similar toFig. 1,- but showinggthe operatingpartsapproaching the opposite limit oftlieinstroke in the direction indicatedy by thedarts. Fig. et is a topplan view yof, themainstructure or mounting with thecvalve tumblingmechanism removed. Fig. 5 is a vertical sectional view. Fig. 6 is adetail sectional view through the vreversiblecontrol valve anditsrcarrier. Fig. 7 is a detail perspective view of the control valveand `its vactuating parts- .disassembled- Fig. 8 is a` detailperspective view of the telescopic power transmission linkxwith thecompression spring removed. Fig. 9 is a perspective .view showing theunder sideV of the oscillatory control or locking member for the controlvalve; Fig. 10 is a perspective vien7 showing the under side of thereciprocatory pulsatorvalve. Fig. 11 is a vperspective view of i theconnecting key for transmitting movement from the piston stem to thereciprocatory pulsator valve. Fig. 12 illustrates av modification.

Like parts are indicated by similar characters of reference throughoutthe several views.`

The;V structure herein shown is particularly adapted for being mountedupon the lid or coverof'a-pail or receiver, which will form t-he closurefor the bottom of the vacuum chamber-contained in the base of thestructure.- Otherwise the pulsatorismounted upon a suitable base. notshown, in lieu of such pail or receiver lid. In the particular form ofembodimentillustrated, the pulsator ycomprises a vertically disposedcylindrical` chambered` base et, carrying at one sidethereof a laterallydisposed integral short` cylinder portion 5, and adjacent tothiscylinder 5 and forming-the top of the base forA vacuum chamber is aflat table like valve bearingV surface 6. Upon this bearing surface orvalve table 6, the pulsatoi and control valve are preferably mounted.The'vacuum chamber 7,' .within the base 4 is provided with a nipple orspud 8, through whichv it communicates with any source of suction suchas a vacuum tank, a pump or other such device. The head of the base iimmediately` beneath the'valve bearing surface is provided with atransverse bore v9. communicating with the interior of the cylinder 5,and within which bore reciprocates a piston stem 10, connected withinthe cylinder 5 to a piston head. The piston y head is actuated to andfro by alternation nately connecting the opposite sides of ythe.

piston with atmosphere and with the suction or vacuum chamber 7respectively. To this end, the valve table 6 is provided with a group ofthree ports 17, 18 and 19. The intermediate port 17 extends downwardlythrough the head or top of the pulsator body and communicates at itslower end with the vacuum chamber 7, which in turn is directly connectedby anipple or spud 8, with a source of suction. The port 18 communicatesthrough a lateral passage 18', shown by .dotted4 lines, with the innerend of the cylinder 5. The remaining port v19 is likewise connectedthrough a communicating passage 19 with the outer end of the cylinder 5and beyond the piston head. These ports are controlled by an oscillatorycontrol valve 20, pivot-ally mounted upon a stud 21, and oscillated toandl fro to alternately connect the suction port 17 with the respectiveports 18 and 19. The disconnected port being uncovered by the movementof the valve 2O admits air at atmospheric pressure to the cylinder. Atthe same time, the opposite end of the cylinder is connected through thecorresponding passage and port with the vacuum chamber 7. As a resultthe atmospheric pressure upon the piston head will shiftk the pistontoward the end of the cylinder connected with the suction or vacuumchamber. This movement of the piston is transmitted to the valve 20 torcverse the position of the valve and the com-- munication of the portscontrolled thereby to admit air pressure to the opposite side of thepiston 10 and reversing the connection of the cylinder 5 with thesuction or vacuum chamber 7. Adjacent to the opposite'sidc of the valvetable 6 is a second group of ports 23, 24 and 25, constituting4 thepulsator ports and controlled by the reciprocatory pulsator valve 26.The intermediate port 23 `communicates with the vacuum chamber 7, Whilethe ports 25 and 26 are independenti ly connected with a separateteatcup connection in this instance a Y connection 27. The teat cup clustersare connected with the connections 27, and alternately actuated asthevalve 26 is reciprocated.

The pulsator valve 26 is recessed on'its under side at 26 to afford anintercommunieating passage between the intermediate port 23 and therespective ports 24 and y25,`

when the valve is at the opposite limits of its stroke. At one limit ofits movement the valve 26 connects the ports 23 and 24, leaving the port25 yopen to atmosphere, While at its opposite stroke this connection isreversed, opening the po-rt 24 to atmosphere and connecting the port 25With the source of suction through the port 23.

As thus far described the structural features are quite similar to theprior constructions referred to.

The reciproca-tory pulsation valve 26 is slotted or splined on its underside as at'28 for engagement over a key or feather 29, carried by therear end of the piston stem 1() and projecting above the top surface ofthe valve table 6. This connecting key may be of any suitable form.However, in the draw ing, 1t has been sho-Wn of a substantially T shape,having a laterally disposed screw stem 30, engaging in a screw threadedhole, in the extremity `of the piston stem 1.0. There is formed in theta ble surface 6, a slot 3,3, communicating with the bore 9. The pistonstem 10 extends Within the bore 9 While the T shaped lkey or couplingmember 29 is inserted through the slot 83,- and is engagedtherewith byrotating the piston and stem by means of the slotted outer extremity 31of the piston stem, to interengage the stem 10 and key or coupler 29.The head or engaging portion of the key or coupler 29 its bearing uponthe surface of the table 6.y

The same is true of the. control valve 20, which likewise isv subjectedto suction or vacuum onkits under side, through the port 17 Whileatmosphere affords a preponderance of pressure upon the top. The bearingsurfaces forV the valve particularly the-pulsatorvalve 26 is slightlyraised above the general. surfacerof the tablet vas particularly` shown'inFig: 4, andlthei'vralve asfit travels tofan'dfroextends;slightlysbeyondthe-limit? of such bearing surface in eitherdirection..

The

This slight elevationof the bearing surface materially facilitates themanufacture and finishing of such surfaces and the tension of the valvelaterally beyond the limit of such bearing` surface and its movementslightly beyond the extremity ofthe bearing` surface at the limit of itsstroke makes the valve self cleaning. That is to say any sediment, dustor accumulation of oil upon the. bearing surface will be pushed by thevalve off such surface onto the surrounding clearance space. Theclearance of this bearing surface may be very slight. I*

The pulsator valve 26 being'y connected with the piston stem 10 throughthekej7 or coupler 29, reciprocates in unison with the piston andalternates the connection of the teat cup spuds 27, with the suction orvacuum chamber 7. This movement of the pulsator valve alternatelysubjects each of the teat cup spuds 27 to the admission of air atatmospheric pressure and to exhaustion through connection with thevacuum chamber 7. n

This to and fro movement of the pulsator valve is transmitted to thecontrol valve 20 to effect itsalternation as the piston and with it thepulsator valve 26 approach the koperated position until the pulsatorvalve and piston approach the opposite limits of theirstroke,fvvhereupon the control valve is not only unlocked, but isactuatedwvith a snap over movement to its reverse position;

The fluid pressure control valve 20 is ac.- tuated to and fro by meansof a valve carrier 35, pivoted concentrically With the valve 2O upon thestud 21. The valve and carrier` are interengaged to oscillate in unisonyet leaving the valve 2()` free for independentad- `justment towardits'valve seat under atmospheric pressure and relieving the valve itselffrom incidental unseating pressures or strains. This valve 2O isprovided in its under face with an elongated recess or vport 36 ofsufficient extent to connect the port 17 with either the ports 18 or 19,according to the position ofthevvalve. For economy of manufacture, thisvalve 20 may be stamped from sheet metal. The stamping operation informing the port or recess 36 embosses ory raises uponI the top of thevalve a correspending rib or bead 37, which for economy is utilized tooperatively interengage the valve With the carrier 35.- This carrier 35is provided `With an arcuate slot 38, in Whiclr:` the'fproj ectingj rib*orbead 37" ofthe valve 20 engages;

The carrier 35 is actuated to and froby alternating push and pullimpulses, transmitted from an oscillatory control member 40, pivoted tothe main structure at 41, and overlying thek reciprocatory pulsatorvalve 26. The control member 40 carries on its under surface a stud orlug 42, which engages in a notch 42', in the top surface of the pulsatorvalve 26, thereby causing the control member 40 to move in unison withthe pulsator valve and the piston alternately in opposite directions.The oscillatory control member 40 carries upon its upper surface aprojecting stud 43, operatively connected by a telescopic link, withy astud 44, eccentrically positioned upon the oscillatory valve carrier Thetelescopic power transmission link comprises two slotted members,relatively movable in longitudinal direction and arranged in overlappingrelation. One of these members 45 has slotted engagement with the stud43. ot the control member 40, while the other slotted member 45 of thetelescopic link has slotted sliding engagement with tbe eccentric stud44 of the valve carrier. rlhe overlapping ends of the slotted member 45are provided with T heads or offset shoulders 46,which aifordabutmentsfor the opposite ends of the compression spring 47, which surrounds andencloses the overlapping. portions of the link members 45, intermediatethe heads or shoulders 46. The construction is such that whether thepull is outwardly upon the extreme ends of the overlapping slottedmembers or the push inwardlly upon the mean or overlapped ends of theslotted members, the effect upon the spring 47 is the same, causing thespring to be com pressed in order that by its reaction it may transmit alike impulse, that is push or pull upon the valve carrier to reverse thevalve. In other words, the pulling eort or pushing effort as the casemay be of the oscillating control members 41 is stored in the spring 47,by subjecting the spring to compression, to be later transmitted to thevalve carrier. The valve carrier is provided with an upwardly projectingstop pin 48 at its free end, while the oscillatory control member 40 isprovided with a coacting dependent fia-nge or lip 49. Under the pushingimpulse of the control member, whereby the valve carrier tends to turninwardly as shown in Fig. 1, the stop pin 48 rides upon the exteriormargin of the flange 49 until the control member reaches the limit ofits stroke, whereupon the pin will pass the end of the flange as thevalve. reverses under the influence of the spring expansion. During thereturn movement under the pulling influence of the control member, thestop pin 48 will ride upon the inner face of the flange or-lip 49 untilthe control member reaches the opposite limit of its stroke, whereuponthe valve will again be reversed by a second expansive movement of thespring. The stop pin of the valve carrier thus moves to andtro acrossthe path of travel of the dependent flange or lip 49 of the controlmember. engaging the flange first upon one side and then upon the other.The movement ofthe valve is limited by such engagement until the partsapproach the limit of' their stroke in either direction, whereupon thevalve is released for reversal under the expansion of the spring. Duringthe movement of' the parts in one direction as `shownin Fig. 1, whereinthe control ymember exerts a pushing impulse, the studs 43 engagesV thehead of the opposite slotted link member carried by the valve carrierstud, while the stud 44 Aof the valve carrier forms an` abutment for thehead of the slotted link member, carried by the control member stud Themovement of the stud 43 toward the valve carrier stud 44 forces the head46 ofthe respective link members toward each other, placing the spring47 under compression. As the stop flange 49 of the control member passesbeyond the pin 48, the vexpansion of the spring oscillates the valvecarrier from the position shown in Fig. l to that shown in' Fig.'3.During the return stroke whereby the control member exerts a pullingimpulse, the studs 43 and 44 engage inV the extreme ends of the slots ofthe respective members 45, tending to reciprocate the members 45outwardly in opposite directions, thereby again causing the heads 46 ofthe link members 45 to move toward each other and again placing thespring` 47 under compression. At the opposite limit of the stroke. thestop ange 49 again passes beyond the pin 48, but in the oppositedirection, thereby releasing the valve carrier, which by the expansionof the spring is returned to the position shown in Fig. 1. It will beobserved that the oscillation of the control valve carrier 35, occurswholly upon one side of a head center position. That is to say, thevalve does not reverse to and fro across a dead center position, neitheris the actuating spring carried to and fro across a dead center point toexert its infiuence in diHerent. directions, as is a very commonexpedient. Likewise it is to be noted that although the valve isactuated by alternating push and pull impulses. the actuating` spring 47is compressed by both impulses and by its subsequent expansion eX- ertsits influence rst in one direction, and then lin the other, to transmitthe initial push or pull impulse, to the oscillatory valve.

The speed with which the alternation or reversal occurs is controlled byregulating the capacity of the control port 17. To this end there isprovided an adjusting screw 50. which intersects the port passage and byits adjustment serves to reduce the capacity of the port and hence thevolume of air passing therethrough and so retard the speed of operation.

It has been customary to provide such throttle screws with lock nuts, bywhich they may be maintained in adjusted relation. However, the useof` alock nut has been found troublesome in that the lock nut frequentlysticks or jams, necessitating the use of tools to'release it. Toovercome this difficulty a spring 51 is provided, which surrounds andencloses the exposed portion of the throttle screw, abutting at one endupon the head of the screw and at its op* posite end upon the mainsupporting struc operation of the parts to avoid complication,

it has been omitted.

rFhe detail view Fig. 12 has been shown as a j modification, wherein theoscillatory control member 40 has been wholly omitted,

yand the stop flange 49, corresponding to the flange 49kbeforeidescribed is mounted directly upon ythe reciprocatory pulsatorvalve 26. This dependent flange 49 performs the same locking function,in Vcontrolling the valve carrier 35 as before described. In lieu of theactuating stud 43 carried by the control member, a `corre-vl spendingstud 43? is mounted directly upon the reciprocatory, valve 26 andconnected with the telescopic links, thus transmitting movement directlyfrom the reciprocatory valve 26 to the control valve carrier 35.

From the above description it will be apparent that there is thusprovided a device of the character described possessing -the particularfeatures of advantage betore enumerated as desirable, but which ob'-viously is susceptible of modification in its form, proportions, detailconstruction and arrangement of parts without departing from theprinciple involved orl sacrificing any of its advantages. j

While in order to comply with the statute the inventionl has beendescribed in lanuage more or less specific as to structural eatures, itis to be understood that the invention isnotlimited to the specificdetails shown, but that the means and construction herein disclosedcomprises the preferred form of several modesA of puttingk the inventionin to effect and the inventionis therefore claimed in any of, its formsor modifications within the legitimate and valid Score-0f the apperdeClaires:

claim:

1. Iii a pulsator mechanism of the char' actery described, wherein aiiuid pressure actuated mechanism operates to alternately subject a pairof pulsation conduits to variations of fluid pressure characterized byan alternating member actuated. by said pressure operated mechanism, anoscillatory control valve for the Huid under pressure and an extensibleaiid'contractible link between the alternating member and the voscil-Llatory valve transmitting alternate push vand pull movements from thealternating member to the oscillatory valve. j

, 2. In a pulsator mechanism of the character described, wherein a fluidpressure actuated-mechanism operates to alternately subject a pair ofpulsation conduits to variations of fluid pressure characterized by analternating member, actuated by saidk pressure operated mechanism,anoscillatory control valve for thefiuid under pressure,and a compressionspring compressed bythe .movement of thel alternating: member ineachdirection which by its successive re- Having thus described myinvention, I

actionsactuates the control valve in alternate directions withoutpassing adead center position in relation with the valve. i

H 3. In azpulsator mechanism of theycharacter described, wherein a fluid,pressure actuated mechanism operates to alternately ,subject a pair ofpulsation conduits to varia tions of fluid pressure, characterizedby/arr alternating member actuated by said pressure operated mechanism,.an oscillatory control valve for the fluid under pressure, a linkconnecting` the alternating member andthe valve comprising twooverlapping longitu-` dinally adjustable sections having slidingengagement with both the: alternating member and the valvel and alsowith each other,

`and a spring-common to the overlapping portions of both sections,tensioned by the relative adjustment of the sections under iniiuence ofthe alternation of the alternating member, the reaction of which springacting through the engaged link section reverses the valve.

4. In a pulsator mechanism of the characatedmechanism operatestoalternately subject apair of pulsation conduits to variations of fluidpressure characterized by an alternating member actuated by said pres-.115, lter described, wherein a iiuid pressure actuL s l sure operatedmechanism, an oscillatory conr trol valve for the fluid underpressure, atelej scopic link interposed between the `alternating member and theoscillatory valve and telescopically adjusted by themovement-of thereciprocatory member, and a spring lten-` sioned by both elongation andcontraction of the telescopic link, the reaction of which reverses thevalve in alternate directions.

la a pulsator mechanism@ the Characliao iro ter described, whereinafluid pressure actuated mechanism operates to alternately subject a pairof pulsation conduits to variations of fluid pressure characterizedby analternating' member actuated by said pressure operated mechanism, anoscillatory control valve for the fluid under pressure, a linkcomprising two overlapping relatively7 movable sections, each sectionhaving a stop portion at its overlapped end, a slot in each section.evtending` beyond the overlapped portions, studs carried by thealternating member andthe valve member engaging through said slots whichwhen moved one away from the other engage the ends of the slots toextend the overlapping link sections and when moved one toward the otherengage the overlapping ends to likewise extend the sections and a`compression spring mounted intermediate the stop portions of theoverlapping ends of the sections, and compressed by the relativemovement of said sections in either direction which by its reaction willreverse the control valve.

6. A motion transmitting link comprising` two overlapping' slottedmembers having stop means at their overlapping ends, and a compressionspring interposed between the stop means of the respective members, andrelatively movable studs engaging in the slots of the respective membersadapted by their relative adjustment to or from each other to extendsaid link against the tension of the spring.

7. A pulsator apparatus wherein a pulsator conduit is intermittentlysubjected to fluctuations of fluid pressure by operation of a fluidpressure actuated operating mechanism, characterized by an oscillatoryvalve yto be intermittently actuated controlling the action of the fluidunder pressure an oscil latory control member having continuousalternating movementthe valve and control member being movable inintersecting paths of travel wholly at one side of a dead centerposition. the movement of the valve being 4limited'firstl in onedirection and then in the other by the position of the control memberuntil said control member approaches the limit of its stroke in eitherdirection, and a spring tensioned by the movement of the control memberin either direction which by its reaction =shifts the valve upon themovement of the control member out of the path of travel of the valve.

8. A pulsator lapparatus wherein a pulsatorconduitis intermittentlysubjected to fluctuations of fluid pressure by operationy of la. fluidpressure actuated-operating mechanism characterized by an oscillatoryvalve Vto beintermittently actuated controlling the action-of the fluidunder pressure, an oscillatory control memberhavingcontinuousalternating movement, the valve and control member being movable inintersecting paths of travel wholly at one side of a dead centerposition, the movement of the valve being limited first in one directionandthen in the other by the position of the control member until .saidcontrol member approaches the limit of its stroke in either direction,anda compression spring compressed by the movement of the control memberin either rdirection, the reaction of which will shift the valve whenthe control membe1l moves out of the path of travel of said valve.

9. A pulsator apparatus wherein a pulsator conduit is intermittentlysubjected to fluctuations of fluidpressure by operation of a fluidpressure actuated operating mechanism characterized by an intermittentlyoperated oscillatory valve controlling the action of the fluid pressureand a continuously alternating oscillatory control member, moving inintersecting paths of travel wholly at one side of a dead centerposition. a. stop flange upon thecontrol member and a stop upon thevalve engagingthe stop flange of the control member first on one sideand then upon the opposite side and released to permit movement of thevalve only as the control member approaches the limit of its stroke ineither direction, and a spring tensioned by the movement of the controlmember to shift the valve when so released.

10. A pulsator apparatus wherein a pulsator conduit is intermittentlysubjected to fluctuations of fluid Ypressure by operation of a fluidpressure actuated operating mechanism characterized by an intermittentlyopera-ted oscillatory valve controlling the action of the fluid pressureand a continuously alternating oscillatory ycontrol member, moving inintersecting paths of `travel wholly at one side of a. dead centerposition, said control memberlimiting the movement of the valve untilthe controlmember approaches the limit of its stroke. and an actuatinglink connecting the control member and valve transmitting alternatingpush and pull impulses through the linkto said` valve, by which thevalve is reversed atpredetermined points in the cycle of operation.

1l. In a pulsator mechanism wherein a pulsator conduit is subjected tointermittent fluctuations of fluid pressure by operation of a fluidpressure actuated operating mechanism, characterized by an oscillatoryvalve controlling the action of the fluid pressure, areciprocatorypulsator valve, an oscillatory control member operativelyengaged with the reciprocatory pulsator valve for oscillatory movementin unison therewith, an alternatingpush and pull link connecting thecontrol memberand said fluid pressure control valve, which shifts thevalve upon the approach of the pulsator valve to either limit ofitsstroke.

12. In a pulsator apparatus, wherein a pulsator conduit isintermittently subjected llO to fluctuations of fluid pressure bvoperation of a fluid pressure actuated mechanism including areciprocatory piston and a pulsator valve movable in unison with thepiston, characterized by a spline carried by the piston and engaging` inthe under side of the pulsator valve to connect said parts inpredetermined alined relation forunison movement. l

13. In a pulsator apparatus wherein a` pul-' sator conduit isintermittently subjected to fluctuations of fluid pressure by operationof a fluid pressure actuated mechanism including a reciprocatory pistonand-a pulsator valve movable in unison with the piston, characterized bya substantially T-shaped connector carried by the piston and engaging`With the pulsator valve to maintain the valve in predetermined relativerelation during the unison reciprocation of the piston and valve.

14. In a pulsator apparatus wherein a pulsator conduit is intermittentlysubjected to fluctuations of fluid pressure by operation of a fluidpressure actuated meuhanism including a reciprocatory piston and apulsator valve movable inl unison with the piston.' characterized by astud having a polygonal headengaging in a `corresponding` recess in thepulsator valve to maintainfthe valve in predetermined relative relationduring the reciprocatory movement thereof.

l5. In a pulsator apparatus wherein a pulsator conduit is intermittentlysubjected to fluctuations of fluid pressure by opera` tion of a fluidpressure actuated mechanism including a reciprocatory piston and apulsator Valve movable in unison with the pis ton, characterized by aconnector engaged in the end of the piston stem and havingr a standingportion surmounted by an elongated head engaging in a correspondingrecess in the valve to operatively connect the valve and piston forunison movement.

In testimony whereof, I have hereunto set my hand this 10th day ofSeptember A. D. 1922.

JOHN A. SCHMITT.

Witnesses E. B. SHUR'rs, J. P. BARLOWE.

